1 (9- to 10-inch) flour tortilla
1/2 cup shredded cheddar cheese
1/2 cup sauerkraut
1/2 cup cooked crumbled sausage
Handful of baby spinach leaves
2 scallions, thinly sliced
Optional toppings: Sour cream, guacamole, hot sauce
Place a 12-inch skillet or griddle over medium-high heat. Place the tortilla in the pan and cover with cheese. Add the sauerkraut, sausage, spinach, and scallions over one half of the tortilla. Once the cheese is melted, use a spatula to lift the side of the tortilla with just cheese over the filling.
Carefully slide the quesadilla onto a cutting board, and cut into wedges to serve.